task hub name must be specified in host.json when using slots

Question

On adding a staging slot in my function app, I see the error:

task hub name must be specified in host.json when using slots

I updated host.json as follows:

{
    "version": "2.0",
    "extensions": {
        "durableTask": {
        "hubName": "staging"
        }
    }
}

Should I specify 2 hub names - for production and staging slots?

How do I fix that?

Answer 1

Task hubs can also be configured using app settings

Check documentation here: https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-task-hubs?WT.mc_id=Portal-WebsitesExtension&tabs=csharp#task-hub-names

You'd configure the specific value in each slot's settings.

Go to the Environment variables blade for your Function App's Slot.

In the App settings tab, add a new variable named TaskHubName with Deployment slot setting checked. Now you can set this variable to different values on each slot.

Answer 2

AzureFunctionsJobHost__extensions__durableTask__hubName = "YOURTASKHUBNAME"

You have to use this key/value pair in configuration